Exchanges of vulnerability, which we naturally tend to avoid, are the pathway through which trusting cooperation is built. This idea is useful because it gives us a glimpse inside the machinery of teamwork. Cooperation, as we’ll see, does not simply descend out of the blue. It is a group muscle that is built according to a specific pattern of repeated interaction, and that pattern is always the same: a circle of people engaged in the risky, occasionally painful, ultimately rewarding process of being vulnerable together.
